Yeah they are. You can 1v1 any heavy with ease, ambush occupied enemies, charge into a well defended point first to divert attention while your allies rush behind you and so much more (blackbolt B point is a perfect location for this).
There's so much utility for jump packs, ranging from surprise attacks and unexpecting flanking manoeuvers to hit and run several times over.
Yes they're squishy, but i prefer the superior mobility. Shield bros cant even touch them.

Worth playing ?Yeah man !Watch closely what i do with that nade and the auto cannon dude and show me 1 ground assault that can do those kinda moves with out either getting shot or blowing himself up as well.

View: https://www.youtube.com/watch?v=GABp4-9m4bwIt's the moments like these that you live for as JPA.
Lets go over the move set.I appear out of nowhere using the cover to go vertically up the ramp from the side , engaged in combat.Once the 2nd guy showed up I found that i'veoverextendedmyself so I I-framed out of there. threw the nadein and flew back in to pin the guy in combat again preventing him from running away . his only option would be to combat roll right here which would not have mattered since he'd not roll far enough from the nade while in combat with me and he would have burned his stam charges for when the nade does explode... and simply flew out just before the nade exploded. I was counting down in my head.. he obviously wasn't.

The problem with JPA and jump classes in general is that you don't really have enough fuel to do what's expected of jump troops: Mainly hit-and-run, ambush, and mobile combat.
A single mistake or an unexpected dodge attempt can cost you that last bit of fuel and leave you stranded while your jump-pack struggles to get its shit together. In addition, you're still incredibly vulnerable in the air if anyone catches sight of you, and why wouldn't they? You're a giant screaming through the air.

I'm not saying "give every other faction the mobility of a Swooping Hawk", but give us a bit more leeway/mobility with our Jump Packs, goddamn.

They are effective imo but annoying to play as..The most annoying part is most ledges take two fuel to get up because you miss it by mere millimeters.Obviously its a miscommunication issue early in development and it should be fixed really.